/*

   Copyright 2002-2003  The Apache Software Foundation

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */
package org.apache.batik.css.engine.value;

import org.apache.batik.css.engine.CSSEngine;
import org.apache.batik.css.engine.CSSStylableElement;
import org.apache.batik.css.engine.StyleMap;
import org.apache.batik.util.CSSConstants;
import org.w3c.css.sac.LexicalUnit;
import org.w3c.dom.DOMException;
import org.w3c.dom.css.CSSPrimitiveValue;

/**
 * This class provides a manager for the property with support for
 * CSS color values.
 *
 * @author <a href="mailto:stephane@hillion.org">Stephane Hillion</a>
 * @version $Id$
 */
public abstract class AbstractColorManager extends IdentifierManager {

    /**
     * The identifier values.
     */
    protected final static StringMap values = new StringMap();
    static {
        values.put(CSSConstants.CSS_AQUA_VALUE,
                   ValueConstants.AQUA_VALUE);
        values.put(CSSConstants.CSS_BLACK_VALUE,
                   ValueConstants.BLACK_VALUE);
        values.put(CSSConstants.CSS_BLUE_VALUE,
                   ValueConstants.BLUE_VALUE);
        values.put(CSSConstants.CSS_FUCHSIA_VALUE,
                   ValueConstants.FUCHSIA_VALUE);
        values.put(CSSConstants.CSS_GRAY_VALUE,
                   ValueConstants.GRAY_VALUE);
        values.put(CSSConstants.CSS_GREEN_VALUE,
                   ValueConstants.GREEN_VALUE);
        values.put(CSSConstants.CSS_LIME_VALUE,
                   ValueConstants.LIME_VALUE);
        values.put(CSSConstants.CSS_MAROON_VALUE,
                   ValueConstants.MAROON_VALUE);
        values.put(CSSConstants.CSS_NAVY_VALUE,
                   ValueConstants.NAVY_VALUE);
        values.put(CSSConstants.CSS_OLIVE_VALUE,
                   ValueConstants.OLIVE_VALUE);
        values.put(CSSConstants.CSS_PURPLE_VALUE,
                   ValueConstants.PURPLE_VALUE);
        values.put(CSSConstants.CSS_RED_VALUE,
                   ValueConstants.RED_VALUE);
        values.put(CSSConstants.CSS_SILVER_VALUE,
                   ValueConstants.SILVER_VALUE);
        values.put(CSSConstants.CSS_TEAL_VALUE,
                   ValueConstants.TEAL_VALUE);
        values.put(CSSConstants.CSS_WHITE_VALUE,
                   ValueConstants.WHITE_VALUE);
        values.put(CSSConstants.CSS_YELLOW_VALUE,
                   ValueConstants.YELLOW_VALUE);

        values.put(CSSConstants.CSS_ACTIVEBORDER_VALUE,
                   ValueConstants.ACTIVEBORDER_VALUE);
        values.put(CSSConstants.CSS_ACTIVECAPTION_VALUE,
                   ValueConstants.ACTIVECAPTION_VALUE);
        values.put(CSSConstants.CSS_APPWORKSPACE_VALUE,
                   ValueConstants.APPWORKSPACE_VALUE);
        values.put(CSSConstants.CSS_BACKGROUND_VALUE,
                   ValueConstants.BACKGROUND_VALUE);
        values.put(CSSConstants.CSS_BUTTONFACE_VALUE,
                   ValueConstants.BUTTONFACE_VALUE);
        values.put(CSSConstants.CSS_BUTTONHIGHLIGHT_VALUE,
                   ValueConstants.BUTTONHIGHLIGHT_VALUE);
        values.put(CSSConstants.CSS_BUTTONSHADOW_VALUE,
                   ValueConstants.BUTTONSHADOW_VALUE);
        values.put(CSSConstants.CSS_BUTTONTEXT_VALUE,
                   ValueConstants.BUTTONTEXT_VALUE);
        values.put(CSSConstants.CSS_CAPTIONTEXT_VALUE,
                   ValueConstants.CAPTIONTEXT_VALUE);
        values.put(CSSConstants.CSS_GRAYTEXT_VALUE,
                   ValueConstants.GRAYTEXT_VALUE);
        values.put(CSSConstants.CSS_HIGHLIGHT_VALUE,
                   ValueConstants.HIGHLIGHT_VALUE);
        values.put(CSSConstants.CSS_HIGHLIGHTTEXT_VALUE,
                   ValueConstants.HIGHLIGHTTEXT_VALUE);
        values.put(CSSConstants.CSS_INACTIVEBORDER_VALUE,
                   ValueConstants.INACTIVEBORDER_VALUE);
        values.put(CSSConstants.CSS_INACTIVECAPTION_VALUE,
                   ValueConstants.INACTIVECAPTION_VALUE);
        values.put(CSSConstants.CSS_INACTIVECAPTIONTEXT_VALUE,
                   ValueConstants.INACTIVECAPTIONTEXT_VALUE);
        values.put(CSSConstants.CSS_INFOBACKGROUND_VALUE,
                   ValueConstants.INFOBACKGROUND_VALUE);
        values.put(CSSConstants.CSS_INFOTEXT_VALUE,
                   ValueConstants.INFOTEXT_VALUE);
        values.put(CSSConstants.CSS_MENU_VALUE,
                   ValueConstants.MENU_VALUE);
        values.put(CSSConstants.CSS_MENUTEXT_VALUE,
                   ValueConstants.MENUTEXT_VALUE);
        values.put(CSSConstants.CSS_SCROLLBAR_VALUE,
                   ValueConstants.SCROLLBAR_VALUE);
        values.put(CSSConstants.CSS_THREEDDARKSHADOW_VALUE,
                   ValueConstants.THREEDDARKSHADOW_VALUE);
        values.put(CSSConstants.CSS_THREEDFACE_VALUE,
                   ValueConstants.THREEDFACE_VALUE);
        values.put(CSSConstants.CSS_THREEDHIGHLIGHT_VALUE,
                   ValueConstants.THREEDHIGHLIGHT_VALUE);
        values.put(CSSConstants.CSS_THREEDLIGHTSHADOW_VALUE,
                   ValueConstants.THREEDLIGHTSHADOW_VALUE);
        values.put(CSSConstants.CSS_THREEDSHADOW_VALUE,
                   ValueConstants.THREEDSHADOW_VALUE);
        values.put(CSSConstants.CSS_WINDOW_VALUE,
                   ValueConstants.WINDOW_VALUE);
        values.put(CSSConstants.CSS_WINDOWFRAME_VALUE,
                   ValueConstants.WINDOWFRAME_VALUE);
        values.put(CSSConstants.CSS_WINDOWTEXT_VALUE,
                   ValueConstants.WINDOWTEXT_VALUE);
    }

    /**
     * The computed identifier values.
     */
    protected final static StringMap computedValues = new StringMap();
    static {
        computedValues.put(CSSConstants.CSS_BLACK_VALUE,
                           ValueConstants.BLACK_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_SILVER_VALUE,
                           ValueConstants.SILVER_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_GRAY_VALUE,
                           ValueConstants.GRAY_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_WHITE_VALUE,
                           ValueConstants.WHITE_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_MAROON_VALUE,
                           ValueConstants.MAROON_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_RED_VALUE,
                           ValueConstants.RED_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_PURPLE_VALUE,
                           ValueConstants.PURPLE_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_FUCHSIA_VALUE,
                           ValueConstants.FUCHSIA_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_GREEN_VALUE,
                           ValueConstants.GREEN_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_LIME_VALUE,
                           ValueConstants.LIME_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_OLIVE_VALUE,
                           ValueConstants.OLIVE_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_YELLOW_VALUE,
                           ValueConstants.YELLOW_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_NAVY_VALUE,
                           ValueConstants.NAVY_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_BLUE_VALUE,
                           ValueConstants.BLUE_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_TEAL_VALUE,
                           ValueConstants.TEAL_RGB_VALUE);
        computedValues.put(CSSConstants.CSS_AQUA_VALUE,
                           ValueConstants.AQUA_RGB_VALUE);
    }

    /**
     * Implements {@link ValueManager#createValue(LexicalUnit,CSSEngine)}.
     */
    public Value createValue(LexicalUnit lu, CSSEngine engine)
        throws DOMException {
        if (lu.getLexicalUnitType() == LexicalUnit.SAC_RGBCOLOR) {
            lu = lu.getParameters();
            Value red = createColorComponent(lu);
            lu = lu.getNextLexicalUnit().getNextLexicalUnit();
            Value green = createColorComponent(lu);
            lu = lu.getNextLexicalUnit().getNextLexicalUnit();
            Value blue = createColorComponent(lu);
            return createRGBColor(red, green, blue);
        }
        return super.createValue(lu, engine);
    }

    /**
     * Implements {@link
     * ValueManager#computeValue(CSSStylableElement,String,CSSEngine,int,StyleMap,Value)}.
     */
    public Value computeValue(CSSStylableElement elt,
                              String pseudo,
                              CSSEngine engine,
                              int idx,
                              StyleMap sm,
                              Value value) {
        if (value.getPrimitiveType() == CSSPrimitiveValue.CSS_IDENT) {
            String ident = value.getStringValue();
            // Search for a direct computed value.
            Value v = (Value)computedValues.get(ident);
            if (v != null) {
                return v;
            }
            // Must be a system color...
            if (values.get(ident) == null) {
                throw new IllegalStateException("Not a system-color:" + ident );
            }
            return engine.getCSSContext().getSystemColor(ident);
        }
        return super.computeValue(elt, pseudo, engine, idx, sm, value);
    }

    /**
     * Creates an RGB color.
     */
    protected Value createRGBColor(Value r, Value g, Value b) {
        return new RGBColorValue(r, g, b);
    }

    /**
     * Creates a color component from a lexical unit.
     */
    protected Value createColorComponent(LexicalUnit lu) throws DOMException {
	switch (lu.getLexicalUnitType()) {
	case LexicalUnit.SAC_INTEGER:
	    return new FloatValue(CSSPrimitiveValue.CSS_NUMBER,
                                  lu.getIntegerValue());

	case LexicalUnit.SAC_REAL:
	    return new FloatValue(CSSPrimitiveValue.CSS_NUMBER,
                                  lu.getFloatValue());

	case LexicalUnit.SAC_PERCENTAGE:
	    return new FloatValue(CSSPrimitiveValue.CSS_PERCENTAGE,
                                  lu.getFloatValue());
        }
        throw createInvalidRGBComponentUnitDOMException
            (lu.getLexicalUnitType());
    }

    /**
     * Implements {@link IdentifierManager#getIdentifiers()}.
     */
    public StringMap getIdentifiers() {
        return values;
    }

    private DOMException createInvalidRGBComponentUnitDOMException
        (short type) {
        Object[] p = new Object[] { getPropertyName(),
                                    new Integer(type) };
        String s = Messages.formatMessage("invalid.rgb.component.unit", p);
        return new DOMException(DOMException.NOT_SUPPORTED_ERR, s);
    }

}
